I became a vamp last night ( Breton Sorc on the DC alliance ) and i was nto able to use knockbacks since most of the time they missed, the strategy i had was to always have Thundering Presence up at all times , since aparently the dmg enemies get from that doesn't miss , and get them with procs from Velocious Curse and Crystal Fragments , had to use a resto staff for quick magicka back. Also , if i got too low on health , i used the Drain Essence for a full heal
@Cayce_of_Kata: My humble apologies; I did not know that functionality had been activated. Now all I have to do is to find their guild ... aka Skyrim ...